Convert centimeters to inches (cm to in) and in to cm (inch to centimeter) Centimetre (American spelling: centimeter, abbreviation and symbol: cm) is a unit of length in the metric system. One cm is equal to one hundredth of a metre (amer. spelling: meter), which is the current SI base unit of length.
Painting Lesson-Color Perspective. Understanding the principles of color perspective; painting a field of strokes with the idea of warm colors coming forward and cool colors receding. Warm colors like red and yellow are considered advancing colors. Cool colors such as blue and green are receding colors.
Color vision. 1  Colorless, green, and red photographic filters as imaged (perceived) by camera. 2  The modern model of human color perception as it occurs in the retina, pertaining to both the trichromatic and opponent process theories introduced in the 19th century.